Personally, I loved this game. The squad mechanics and tactics actually made me think through my actions, as I tried to save the lives of my fellow soldiers. This sets Brothers in Arms appart from other games, since you can't run-and-gun mowin down hordes of enemies.
That said, this game is definately a mature game. The player has to shoot and kill many enemy soldiers to complete their objectives. Bodies fly because of explosions, and there is alot of graphic blood in many of the cut scenes. I find the kill cam disgusting with its spew of blood and limbs being blown off. There is also prevelant mature language. Luckily, you can turn off the language, kill cam, and gore in the options menu. That said, the game still focuses on killing and should only be played in small spurts. This game should only be played if you know your kid is mature to handle graphic sequences of combat, equal to those seen in Saving Private Ryan and other such movies.